[masonbason]

To me it has to be

Lisa, cause she should now realise by now without being told by others that shes got no chance of winning big brother and there are no magazine deals for her.

or could it be

Marcus, who thought he had a chance with Noirin and than is now sulking on national tv for something he didnt have and is now acting the part of the spurned lover. Unrequited lust at its best.

or

David, for exactly the same reasons as lisa.